WALTER SK KSP screw compressors: direct drive without losses

WALTER SK KSP screw compressor with direct drive in a soundproofed enclosure

7-year warranty

Direct-drive, fixed-speed compressors 11–315 kW

The SK KSP range is designed for operations with constant air consumption. The screw element is connected to the motor by a coupling, without a belt, so no power is lost in the transmission. The latest generation screw elements and energy-efficient motors keep operating costs low, and fixed speed means a simple design. The range has 17 models from 11 to 315 kW; for power inputs of 11 and 15 kW, ready-made assemblies on an air tank are also available as SKTG KSP.

17models in the range

11–315 kWmotor power input

≤ 3 ppmoil mist in the outlet air

8, 10, 13 barworking pressures

All 17 models of WALTER SK KSP

Sorted by power input. For fixed-speed machines, there is one air delivery value at each pressure. All models are manufactured for 8, 10, and 13 bar.

WALTER SK KSP screw compressors — all 17 versions
Model	Power input	Air delivery 8 bar	Air delivery 10 bar	Air delivery 13 bar	Connection	Dimensions L × W × H	Weight	Noise level
SK 11 KSP	11 kW	1.65 m³/min	1.5 m³/min	1.12 m³/min	G ¾″	1,090 × 730 × 1,080 mm	244 kg	62 dB(A)
SK 15 KSP	15 kW	2.25 m³/min	2.15 m³/min	2 m³/min	G ¾″	1,090 × 730 × 1,080 mm	244 kg	62 dB(A)
SK 18,5 KSP	18.5 kW	3.2 m³/min	3 m³/min	2.2 m³/min	G 1″	1,300 × 880 × 1,170 mm	378 kg	64 dB(A)
SK 22 KSP	22 kW	4 m³/min	3.6 m³/min	2.88 m³/min	G 1″	1,300 × 880 × 1,170 mm	418 kg	64 dB(A)
SK 30 KSP	30 kW	5.21 m³/min	4.5 m³/min	3.96 m³/min	G 1½″	1,500 × 1,030 × 1,280 mm	518 kg	66 dB(A)
SK 37 KSP	37 kW	6.2 m³/min	5.6 m³/min	4.5 m³/min	G 1½″	1,500 × 1,030 × 1,280 mm	591 kg	66 dB(A)
SK 45 KSP	45 kW	7.51 m³/min	7.1 m³/min	6.05 m³/min	G 1½″	1,500 × 1,030 × 1,280 mm	690 kg	66 dB(A)
SK 55 KSP	55 kW	9.41 m³/min	8.7 m³/min	7.13 m³/min	G 2″	2,158 × 1,331 × 1,600 mm	1,128 kg	68 dB(A)
SK 75 KSP	75 kW	12.7 m³/min	11 m³/min	10.2 m³/min	G 2″	2,158 × 1,331 × 1,600 mm	1,225 kg	68 dB(A)
SK 90 KSP	90 kW	16 m³/min	13.7 m³/min	11.6 m³/min	DN 65	2,727 × 1,666 × 1,800 mm	1,795 kg	70 dB(A)
SK 110 KSP	110 kW	19.1 m³/min	17.9 m³/min	13.7 m³/min	DN 65	2,727 × 1,666 × 1,800 mm	2,124 kg	70 dB(A)
SK 132 KSP	132 kW	23 m³/min	20 m³/min	17.5 m³/min	DN 65	2,727 × 1,666 × 1,800 mm	2,281 kg	72 dB(A)
SK 160 KSP	160 kW	24 m³/min	23.7 m³/min	21.15 m³/min	DN 65	2,650 × 1,700 × 1,900 mm	3,300 kg	75 dB(A)
SK 185 KSP	185 kW	29 m³/min	28 m³/min	24 m³/min	DN 65	3,410 × 2,170 × 2,260 mm	4,000 kg	77 dB(A)
SK 200 KSP	200 kW	29 m³/min	28.7 m³/min	24.5 m³/min	DN 80	3,410 × 2,170 × 2,260 mm	4,400 kg	77 dB(A)
SK 250 KSP	250 kW	41 m³/min	40 m³/min	32.6 m³/min	DN 100	3,900 × 2,170 × 2,260 mm	4,700 kg	79 dB(A)
SK 315 KSP	315 kW	49.5 m³/min	40.5 m³/min	39.5 m³/min	DN 125	3,900 × 2,170 × 2,260 mm	4,900 kg	80 dB(A)

As pressure increases, air delivery decreases. Therefore, select based on the air delivery at the pressure you actually need, not just the value at 8 bar.

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Design of the SK KSP series

The series was developed with the aim of reducing losses and operating costs. The biggest difference compared to belt-driven machines lies in the power transmission: the screw airend and the motor are connected by a coupling.

Direct drive without losses

The screw airend is connected directly to the motor by a coupling. Torque transmission is robust and efficient, without losses on a belt or gearbox.

Gears according to the AGMA standard

The gears in the screw airends are manufactured according to the AGMA (American Gear Manufacturers Association) standard.

Three-stage oil separation

Three-stage separation provides high-quality air and works more efficiently with lower noise and lower pressure loss. The outlet air contains no more than 3 ppm of oil mist.

Cooling

Cooling is provided by an efficient axial fan and a temperature-controlled motor.

WALTER CONTROLLER control unit

It monitors cooling and the operating conditions of the machine.

Piping and oil distribution in the housing of the WALTER SK KSP compressor — Piping and oil lines in the housing

Electric motor with cooling fins in the WALTER SK KSP compressor — Electric motor with cooling fins

Which models share a housing

Models with neighboring power inputs share a common housing. Therefore, when moving to a higher power input, the footprint and connection often do not change.

Housings of WALTER SK KSP screw compressors
Housing L × W × H	Models	Connection	Weight
1,090 × 730 × 1,080 mm	SK 11 KSP, SK 15 KSP	G ¾″	244 kg
1,300 × 880 × 1,170 mm	SK 18,5 KSP, SK 22 KSP	G 1″	378–418 kg
1,500 × 1,030 × 1,280 mm	SK 30 KSP, SK 37 KSP, SK 45 KSP	G 1½″	518–690 kg
2,158 × 1,331 × 1,600 mm	SK 55 KSP, SK 75 KSP	G 2″	1,128–1,225 kg
2,727 × 1,666 × 1,800 mm	SK 90 KSP, SK 110 KSP, SK 132 KSP	DN 65	1,795–2,281 kg
2,650 × 1,700 × 1,900 mm	SK 160 KSP	DN 65	3,300 kg
3,410 × 2,170 × 2,260 mm	SK 185 KSP, SK 200 KSP	DN 65, DN 80	4,000–4,400 kg
3,900 × 2,170 × 2,260 mm	SK 250 KSP, SK 315 KSP	DN 100, DN 125	4,700–4,900 kg

Fixed speed, or inverter?

A machine with fixed speed is simpler and suits applications where demand stays at the same value. For fluctuating consumption, compare the range with an inverter.

Ventilek advises

Fixed speed requires constant demand.

Record how much air you consume over the course of a shift. If the value does not change much, fixed speed is the simplest solution. If it fluctuates, compare the SF KSP range with an inverter, which continuously adjusts output to demand.

How to choose a compressor

Frequently Asked Questions

How does the SK KSP differ from the SF KSP?: Both machines have a direct drive. The SK KSP has fixed speed and delivers a constant amount of air, while the SF KSP has an inverter and continuously adjusts air delivery to demand. Fixed speed is suitable for constant consumption, while the inverter is suitable for fluctuating consumption.
How much air does the machine deliver at higher pressure?: As pressure increases, air delivery decreases. For example, the SK 45 KSP model delivers 7.51 m³/min at 8 bar, 7.1 m³/min at 10 bar, and 6.05 m³/min at 13 bar. Exact values for all models can be found in the table.
Is the SK KSP also available on an air receiver?: Yes for the 11 and 15 kW models. As a complete assembly on a 500 l air receiver, they are available in the SKTG KSP series, also in the COMBO version with a dryer.
What connections do they have and how loud are they?: Up to 15 kW the connection is G ¾″, for 18.5 and 22 kW G 1″, for 30 to 45 kW G 1½″, and for 55 and 75 kW G 2″. From 90 kW the connection is DN 65, for the SK 200 KSP DN 80, for the SK 250 KSP DN 100, and for the SK 315 KSP DN 125. Noise level ranges from 62 dB(A) for the smallest model up to 80 dB(A) for the largest.
How often is service needed?: For all WALTER screw compressors, every 2,000 motor hours. Regular maintenance is also a condition for the seven-year warranty.

All models are covered by a 7-year warranty on the entire machine. Warranty and service conditions can be found on the page Šroubové kompresory WALTER. Air delivery is stated according to ISO 1217:2009, Annex C, sound pressure level with a tolerance of ±3 dB(A).